Copyright is very technical and very tricky. I like to stay completely on safe side. I think you did the right thing.
One time in surfing the net, I ran across a finished quilt that was for sale on a private website. It was an exact replica of a famous designer(Nancy) in her Landscape Book. I wrote to Sewing with Nancy and gave her the website. She wrote back and said it was violation of copyright, and thanked me. The private website, removed the Replica Quilt.
Traditional Quilt blocks are not copyrighted, to my knowledge, so they can be created and sold, at least this is my understanding.